I wonder if this is relevant to Trump?: "Confabulation is a neuropsychiatric disorder that causes someone to unintentionally create false memories. People who confabulate genuinely believe the information they provide is true, and are not intentionally lying or misleading others. This condition is sometimes called "honest lying"...
"Confabulation is an unintentional creation or conflation of memories due to a cognitive error. Lying is conscious, purposeful, and used to deceive others"
"Confabulation is a symptom linked brain illnesses, including Alzheimer's disease and brain injury. When people confabulate, they may tell stories that have some truth in them, and some parts of these stories may make sense."